Creamy Fennel and Sweet Potato Soup Without Cream
Fennel, onion and sweet potato become a golden, velvety soup with no cream added. The sweet potato gives the broth body, while the fennel brings a gentle anise flavour that softens as it cooks. Keep the onions pale and cook the vegetables until they crush easily: those two details matter more than adding extra ingredients.
This is a blended fennel soup thickened with sweet potato rather than flour or dairy. It works as a warm starter, a simple lunch with bread, or a make-ahead bowl for a cool evening. The vegetables are sweated first, simmered in vegetable broth and blended directly in the pot.
The recipe is based on my YouTube video, with a few adjustments since publication to clarify the vegetable weights, seasoning and texture checks.
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A vegetable soup with its own character
I use the sweet potato for the liaison, or thickening, as shown in the video. Once cooked and blended, it ties the fennel and onion into the broth and gives the soup its warm colour. There is no need to add cream just to make the spoonful feel smooth.
Fennel remains the main flavour. This is different from a blended carrot soup, where carrot leads, and from butternut squash soup, which has a squash base. It is also a lighter style than broccoli-cheddar soup: the richness here comes from the vegetable purée and a little olive oil, not cheese.
The soup is vegetable-based and made without dairy. It is vegan when the broth is vegan too. It is not a protein-rich meal by itself, so think of it as a starter or serve it with something more substantial for lunch. Its anise note works year-round, even though a steaming bowl is especially welcome in cooler weather.
The ingredients and the right balance
The video gives about 2¼ lb of fennel and onions combined, plus 14 oz of sweet potato. For a clear home recipe, use roughly 1½ lb of cleaned fennel and 11 oz of peeled onion. Weigh the fennel after trimming: the stalks, damaged outer layers and dense core do not belong in that weight.
Choose bulbs that feel firm, with no large soft patches. Cut away the dry stalk ends and the tough triangular core at the base. Tender outer layers can stay; woody or badly bruised pieces should come off. Even a good blender struggles with fibrous stalks.
Orange sweet potato supplies both colour and thickness. Peel it, then cut it into small, even cubes so it cooks at the same pace as the other vegetables. Start with 4¼ cups of homemade vegetable broth. A gently flavoured broth lets the fennel remain distinct; a very dark or heavily seasoned stock can take over.
Olive oil, salt and black pepper complete the base. The video uses unsalted broth and a fairly assertive pepper quantity. Here the seasoning starts more moderately, with a final adjustment after blending. Salted commercial broth needs less added salt. A little parsley on the bowl is optional, as in the video.
How to make the soup
1. Prepare the onion and fennel
Dice the peeled onions. Halve the trimmed fennel through the base, remove the tough core and dice the bulb into pieces about ½ inch across. Keep the pieces similar in size; a few very large chunks make the cooking time less predictable.
Set a heavy pot over medium heat and add the olive oil. Add the onion and cook gently for about 4 to 5 minutes, stirring. It should become translucent around the edges without brown patches. The video starts with a hot pot, but the sweating itself is gentle. Lower the heat if the onion catches or the oil smokes.
2. Sweat the fennel and add the broth
Stir in the diced fennel. Cook for another 4 to 5 minutes, turning the vegetables through the oil. They do not need to be fully soft yet. What I look for is an even glossy coating and a softer smell from the onion, with no browned crust on the bottom.
Pour in the vegetable broth. Add the salt and pepper, using less salt if your broth already contains it. Stir to loosen any vegetables stuck to the base. Sweating without colouring keeps this soup different from the deep browned flavour of French onion soup.
3. Add the sweet potato and simmer
Add the peeled sweet potato cubes. Bring the soup to a boil, then reduce the heat to a steady, gentle simmer. Cook for about 35 to 40 minutes, stirring occasionally. Begin checking sooner if the cubes are particularly small.
The sweet potato should crush easily against the side of the pot, and a knife should pass through a piece of fennel without resistance. Do not blend just because the timer has rung: undercooked fennel leaves a coarse, stringy texture. If the liquid reduces too far before the vegetables soften, add a small splash of hot water or broth.
Keep the simmer controlled rather than boiling violently. The vegetable-to-broth ratio makes a fairly thick soup, so excessive evaporation can turn it into a purée before the cooking is finished. The same need to cook the vegetables fully applies to a blended leek and vegetable soup, although that recipe uses ordinary potatoes.
4. Blend and adjust the consistency
Turn off the heat. Blend with an immersion blender, keeping the blade head submerged so hot soup does not splash. Move it slowly through the pot until the mixture looks uniform. If you use a jug blender, let the soup cool slightly and follow its hot-liquid instructions, working in small batches and venting safely.
The soup should flow from a ladle in a thick ribbon and settle into the bowl. It should not stand in a mound. Add hot broth or water a few tablespoons at a time if needed, then blend briefly again. Taste now: the finished purée can need a different salt balance from the unblended broth.
Warm gently if necessary and serve in shallow bowls. Add a small parsley sprig if you want the same presentation as the video. Keep the garnish modest so the golden soup remains the focus.
Avoiding a stringy or overly sweet result
Trimming is the first texture step. The hard fennel core and woody stalks can stay fibrous after the softer bulb has cooked. Removing them is more effective than trying to blend them away later.
For the intended balance, keep fennel as the largest share of the fennel-and-onion mixture. A pot with much more onion or sweet potato will taste sweeter and less distinctly of fennel. There is no sugar in this recipe, and it does not need any.
Substitutions
A regular potato can replace the sweet potato by weight. It gives body with less sweetness, but the colour becomes paler and the flavour changes. Cut it into similar small cubes and check that it is fully tender before blending. For a potato-led soup instead, potage Parmentier is the more direct choice.
Use a low-sodium store-bought vegetable broth if you do not have homemade broth. Water is possible, but the result has less depth; do not assume it tastes identical. Olive oil keeps this version dairy-free, while butter can replace it if that is not a requirement.
Leave out the parsley if you prefer a plain bowl. Fennel seeds are not a substitute for the bulbs: they provide concentrated aroma but do not replace the bulk of the vegetables. If you want to explore another vegetable purée, a simple broccoli soup offers a different flavour without trying to disguise this soup.
Frequently asked questions
Does the soup taste strongly of licorice?
Fennel has an anise flavour, but simmering it with onion and sweet potato makes that note gentler. It should still be noticeable. If you dislike fennel itself, the other vegetables will not completely hide it.
Why is mine thicker the next day?
The cooled vegetable purée can feel thicker than it did hot. Reheat over moderate heat and stir in broth or water gradually. Avoid adding a large amount at once, which makes the seasoning harder to correct.
Can I freeze it?
Yes. Cool promptly, portion into containers and leave room for expansion. Refrigerate for up to 3 days or freeze for up to 3 months. Thaw in the refrigerator and reheat thoroughly, stirring; a brief blend can restore a smoother texture.
Can I finish it with cream?
You can add a little cream to your portion, but it is not part of the original recipe and is not needed for thickening. For a different creamy vegetable bowl, try pumpkin soup rather than adding enough cream to overwhelm the fennel.
What to serve alongside
Serve with soft focaccia for dipping, or offer homemade garlic croutons separately so they keep their crunch. The bowl already contains sweet potato, so a small amount of bread is often enough for a starter.
For a more substantial lunch, a lentil and egg salad brings a different texture alongside the smooth soup. If you are choosing soups for several meals, minestrone with beans and pasta gives you beans, pasta and visible vegetables, while this fennel version stays entirely blended. My collection of soup recipes has more options for changing the flavour without repeating the same bowl all week.
Creamy Fennel and Sweet Potato Soup Without Cream
Ingredients
- 1½ lb fennel bulbs trimmed weight, diced
- 11 oz yellow onions peeled weight, diced
- 14 oz orange sweet potato peeled weight, cut into small cubes
- 2 tbsp olive oil
- 4¼ cups low-sodium or unsalted vegetable broth plus more as needed
- 1 tsp fine salt or less with salted broth, then adjust to taste
- ½ tsp ground black pepper then adjust to taste
- Small parsley sprigs optional, for serving
Instructions
- Trim the fennel stalks, tough core and damaged layers; dice the bulbs and onions. Peel and cube the sweet potato.
- Heat olive oil in a heavy pot over medium heat. Sweat the onions for 4 to 5 minutes without browning.
- Add fennel and sweat for another 4 to 5 minutes, stirring. Add broth, salt and pepper; reduce added salt if using salted broth.
- Add sweet potato, bring to a boil and reduce to a gentle simmer. Cook about 35 to 40 minutes, stirring occasionally, until all vegetables crush easily. Add a splash of hot water if evaporation is excessive.
- Turn off the heat and blend smooth with an immersion blender, keeping its head submerged. Follow the manufacturer’s hot-liquid instructions if using a jug blender.
- Add hot broth or water gradually if needed for a thick but flowing soup. Taste and adjust seasoning. Reheat gently if necessary and serve with optional parsley.
